Don't know if all are really needed, just noticed that there not there.
Macedonian (rare)
Ѐ
Ѝ
ѐ
ѝ
Vietnamese (seem to be rather common)
Ơ
ơ
Ư
ư
Pinyin
Ǖ
Ǘ
Ǚ
Ǜ
Danish (rare)
Ǽ
ǽ
Ǿ
ǿ
IPA (rare)
ɚ
ɝ
Version: unspecified
Severity: enhancement